未定义或无权限访问的属性上调用unset()方法时会触发__unset()方法。
示例代码如下：
<?php
class Person
{
public $sex;
private $name;
private $age;
public function __construct($name="", $age=25, $sex='Male')
{
$this->name = $name;
$this->age = $age;
$this->sex = $sex;
}
/**
* @param $content
*
* @return bool
*/
public function __unset($content) {
echo "It is called automatically when we use the unset() method outside the class.<br>";
echo isset($this->$content);
}
}
$person = new Person("John", 25); // 赋初始值
unset($person->sex),"<br>";
unset($person->name),"<br>";
unset($person->age),"<br>";
输出结果如下：
It is called automatically when we use the unset() method outside the class. 1 It is called automatically when we use the unset() method outside the class. 1
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